From 055e4fd96e95b0eee0d92fd54a26be7f0d3bcad0 Mon Sep 17 00:00:00 2001 From: Ben Hutchings <ben@decadent.org.uk> Date: Mon, 29 Apr 2013 15:07:49 -0700 Subject: [PATCH] mm: try harder to allocate vmemmap blocks Hot-adding memory on x86_64 normally requires huge page allocation. When this is done to a VM guest, it's usually because the system is already tight on memory, so the request tends to fail. Try to avoid this by adding __GFP_REPEAT to the allocation flags. Addresses http://bugs.debian.org/699913 Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reported-by: Bernhard Schmidt <Bernhard.Schmidt@lrz.de> Tested-by: Bernhard Schmidt <Bernhard.Schmidt@lrz.de> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/sparse-vmemmap.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 1b7e22ab9b09..22b7e18e9dea 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -53,10 +53,12 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node) struct page *page; if (node_state(node, N_HIGH_MEMORY)) - page = alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO, get_order(size)); + page = alloc_pages_node( + node, GFP_KERNEL | __GFP_ZERO | __GFP_REPEAT, + get_order(size)); else - page = alloc_pages(GFP_KERNEL | __GFP_ZERO, + page = alloc_pages( + GFP_KERNEL | __GFP_ZERO | __GFP_REPEAT, get_order(size)); if (page) return page_address(page);